Where Did Groupon's Billion Dollars Go? — In January, Groupon raised $950 million. By the end of March, it had $209 million in cash. — What happened to all that money? — The company's IPO filing spells that out: Almost all of it went right back out the door, to employees and early investors.

Apple signs Universal Music to iCloud — Apple has cut a licensing deal with Universal Music Group that will enable Apple's online music store to offer songs from the largest of the four top record companies, sources with knowledge of the talks told CNET. — The agreement means Apple …

Windows 8: The Beginning of the End of Windows — I have a longstanding rule for evaluating new tech products: Don't judge anything by the demo. I've seen far too many product previews that hid fundamental flaws in usability. Until you can touch and play with the product on your own …

Google's CEO steps into spotlight — In his most extensive public comments since becoming Google's (GOOG) CEO, Larry Page on Thursday delivered a carefully crafted response to critics who say the company is too free-spending, too unfocused and too aloof to investors and Wall Street.

Sony probing claim hackers stole user information — LONDON - Sony has been hit by a second massive data breach, hackers claim, another potential embarrassment for a company that is struggling to restore its image following the loss of millions of credit card numbers through its PlayStation Network.

Gmail Hack Targeted White House — People who work at the White House were among those targeted by the China-based hackers who broke into Google Inc.'s Gmail accounts, according to one U.S. official. — The hackers likely were hoping the officials were conducting administration business …

Killer App: Army Tests Smartphones for Combat — The Army plans to hold desert trials in the U.S. next week to test off-the-shelf iPhones, Androids and tablet computers for use in war. — Starting Monday, the Army will also stress-test a variety of applications that could allow troops …

The Billion-Dollar Startup Club: Then and Now — “A million dollars isn't cool. You know what's cool? A billion dollars.” — Once news of Groupon's IPO filing subsides, look out for headlines that Airbnb has joined the billion-dollar club. The social bed and breakfast startup …

Amazon May Soon Need to Collect Sales Tax — A proposal in the U.S. Senate aims to end the longtime exemption for e-commerce — California visitors to Wal-Mart Stores' (WMT) website must pay $214 to buy a Philips Electronics (PHG) 22-inch LCD HDTV, one of the hottest-selling flat-panel televisions on the Web.